11 yr old Deliberatley Urinating..

Once again i am at my wits end.
My 11yr old Son has started Urinating on one of his siblings belongings. Under Bed, in wardrobe , on toys etc. He had this problem 5 yrs ago and after suffering for 2 yrs we sent him to his fathers house ( at his request ) to live. After 2yrs of being there, he insisted on coming home again, and we all had desperatley hoped it was just a phase he was going through.
But alas we are smelling it again and he has confessed. He does it at night when we are sleeping, he says because he is angry and frustrated that he argues a lot with his other brother.

He has Aspergers and is not on any medication. Has anyone heard of this ??? It devasted our family of 7 last time i cant believe its happening again : ( HELP ANYONE PLEASE

Usually this is caused by overstimulation. The kid has to much going on in his life. Aspergers are extremely sensitive to sensory stimuli. Noise, light, smell, touch. Social interaction is also very stressful.

Try and keep him as secluded as possible, shield him from sensory input. After a while it should calm down.